Table 1 Characteristics of 835 patients included in the study.
Characteristics | Training set (N = 668) | Test set (N = 167) | P-value |
|---|---|---|---|
Sex | 0.807 | ||
Male | 377 (56.44%) | 96 (57.49%) | |
Female | 291(43.56%) | 71 (42.51%) | |
Vital status | 0.466 | ||
Alive | 355 (53.14%) | 94 (56.29%) | |
Dead | 313 (46.86%) | 73 (43.71%) | |
Survival month | 60.61 ± 39.34 | 62.28 ± 40.56 | 0.756 |
Age at diagnosis | 27.66 ± 19.49 | 29.19 ± 20.65 | 0.687 |
Year of diagnosis | 2007.30 ± 2.36 | 2007.37 ± 2.36 | 0.759 |
Anatomical location | 0.069 | ||
Head and neck | 55 (8.23%) | 13 (7.78%) | |
Trunk | 66 (9.88%) | 27 (16.17%) | |
Limb | 547 (81.89%) | 127 (76.05%) | |
Histological grade | 0.650 | ||
Grade I | 21 (3.14%) | 7 (4.19%) | |
Grade II | 50 (7.48%) | 16 (9.58%) | |
Grade III | 191 (28.60%) | 48 (28.74%) | |
Grade IV | 406 (60.78%) | 96 57.49%) | |
Extension | 0.914 | ||
Distant | 155 (23.20%) | 39 (23.35%) | |
Localize | 194 (29.04%) | 51 (30.54%) | |
Regional | 319 (47.76%) | 77 (46.11%) | |
Tumor size (mm) | 101.71 ± 61.78 | 93.86 ± 53.61 | 0.071 |
Primary tumor number | 0.015 | ||
One primary only | 637 (95.36%) | 166 (99.40%) | |
More primaries | 31 (4.64%) | 1 (0.60%) | |
Local lymphatic metastasis | 1.000 | ||
Yes | 20 (2.99%) | 5 (2.99%) | |
No | 648 (97.01%) | 162 (97.01%) | |
Distant metastasis | 0.897 | ||
Yes | 135 (20.21%) | 33 (19.76%) | |
No | 533 (79.79%) | 134 (80.24%) | |
Surgery | 0.450 | ||
Yes | 605 (90.57%) | 148 (88.62%) | |
No | 63 (9.43%) | 19 (11.38%) | |
Radiation | 0.588 | ||
Yes | 59 (8.83%) | 17 (10.18%) | |
No/unknown | 609 (91.17%) | 150 (89.82%) | |
Chemotherapy | 1.000 | ||
Yes | 560 (83.83%) | 140 (83.83%) | |
No/unknown | 108 (16.17%) | 27 (16.17%) | |
